Malicious PDF — malware analysis report

Static analysis result for SHA-256 79933c531b228dfa…

MALICIOUS

PDF

93.5 KB Created: 2021-09-13 22:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a04e6bb5f703fb99b7f837c2f9f9d64 SHA-1: d12b1767e9be204d358fd16f3de035b49220e5c0 SHA-256: 79933c531b228dfa421d2b40454b668971ab271ec660491b6b940570af553d3c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://villadorottya.hu/uploads/frontend/files/89232042484.pdf In PDF document text
    • http://zajazd-broadway.pl/galeria/file/61879675204.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/97016451366.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/18480623483.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/jajesozisaxunos.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/jubipagerofuminewi.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/dubifememobozivexesetu.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/soviwep.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/30210317865.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/fatodazojidaniremogumuxo.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/56126204904.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/07125354769.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210902_170236.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/zadewufefusej.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/76904990775.pdfIn PDF document text
    • http://ailizia.com/userfiles/23485723323.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/jidebifowisemewiz.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/14868512264.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/rufugepuf.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/93497280167.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/mopubelowowulemokufat.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/53737228683.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/bededegev.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/wopebuderozuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=short+stories+for+effective+communication+book+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 11312 bytes
SHA-256: a6c3271c16358b487775f58ef27f438f490526166d12bd02413c7ba1c081b268
font_01_sfnt_off00011f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 18672 bytes
SHA-256: a36ff887dd75e423e716bde6285bbd683d52cc12b1f02f27d34fb2dec7a5af71
font_02_sfnt_off00014f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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